Prayer has been noted to be one of the most powerful weapon God has given us that is used the less. A weapon that the enemy doesn't want us to understand or use, especially exponentially, because it would be a noticeable game changer over the gates of Hell.

Scripture Ref.

Deuteronomy 32:30, 1/1K to flight; 2/10K to flight - A word for the enemies of Israel because they didn't obey
Leviticus 26:8, 5/100 to flight; 10/10K to flight - A word for the children of Israel if they obedience
Matthews 12:45, seven more evil
Joshua 23:10, God fights for us